The drills, according to the Navy, are aimed at preventing “the import and export of North Korea nuclear weapons and other weapons of mass destruction, and at the implementation of U.N. Security Council resolutions regarding illicit and provocative actions of North Korea.” The exercises will take place for two days, according to Sputnik.

A total of four vessels are participating: two Australian frigates, the Melbourne and the Parramatta, a U.S. Chafee destroyer and a South Korean Sejong destroyer equipped with an Aegis combat system.

The exercises coincide with U.S. President Donald Trump’s trip across Asia. In a speech before U.S. troops based in Japan, Trump claimed that “no dictator, no regime and no nation, should underestimate, ever, American resolve.”

“Every once in a while, in the past, they underestimated us. It was not pleasant for them, was it? It was not pleasant. We will never yield, never waver and never falter in defense of our people, our freedom, and our great American flag.”

The security council session convened to discuss the international response to the DPRK’s launch of a successful ballistic missile test earlier this week, which Haley said “shows that North Korea does not want to be part of a peaceful world.”

Speaking at the session, Haley said that the DPRK’s “actions are quickly closing off the possibility of a diplomatic solution. The United States is prepared to use the full range of our capabilities to defend ourselves and our allies. One of our capabilities lies with our considerable military forces. We will use them if we must.”

Recent satellite photos show that activities have resumed at North Korea’s nuclear testing site.

North Korea’s state media published a rare criticism of China on Wednesday, accusing Chinese state media commentaries of undermining its relations with Beijing and worsening current tensions on the peninsula.